package com.sky.service.impl;

import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import com.sky.utils.StpUserUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : KongW
 * @create 2023/10/15 18:41
 */
@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    @Override
    public void addShopping(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入购物车的商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        //复制对象
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //获取并设置用户名
        shoppingCart.setUserId(StpUserUtil.getLoginIdAsLong());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果已经存在，只需要将数量加一
        if(list != null && list.size()>0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateById(cart);
        }else {
            //如果不存在，需要插入一条购物车数据

            //判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null){
                //本次添加到购物车的是菜品
                Dish dish = dishMapper.selectById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                //本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);

        }

    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showshoppingCart() {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(StpUserUtil.getLoginIdAsLong());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(StpUserUtil.getLoginIdAsLong());
        shoppingCartMapper.delete(shoppingCart);
    }

    /**
     * 删除一个购物车里的商品
     * @param shoppingCartDTO
     */
    @Override
    public void subOne(ShoppingCartDTO shoppingCartDTO) {
        //复制对象
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(StpUserUtil.getLoginIdAsLong());
        //查找对象
        shoppingCart = shoppingCartMapper.list(shoppingCart).get(0);
        shoppingCart.setNumber(shoppingCart.getNumber() - 1);
        if (shoppingCart.getNumber() == 0){
            //删除商品
            shoppingCartMapper.delete(shoppingCart);
        }else {
            shoppingCartMapper.updateById(shoppingCart);
        }

    }


}
